Migrate DDC to the new analysis driver.

pkg/dev_compiler/lib/src/compiler/command.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import 'dart:async';
 import 'dart:io';
 import 'package:analyzer/src/command_line/arguments.dart'
     show
         defineAnalysisArguments,
         filterUnknownArguments,
         ignoreUnrecognizedFlagsFlag;
 import 'package:analyzer/src/generated/source.dart' show Source;
 import 'package:analyzer/src/summary/package_bundle_reader.dart'
     show InSummarySource;
 import 'package:args/args.dart' show ArgParser, ArgResults;
 import 'package:args/command_runner.dart' show UsageException;
+import 'package:dev_compiler/src/compiler/compiler.dart';
 import 'package:path/path.dart' as path;
 
 import '../analyzer/context.dart' show AnalyzerOptions;
 import 'compiler.dart' show BuildUnit, CompilerOptions, ModuleCompiler;
 import 'module_builder.dart';
 
 const _binaryName = 'dartdevc';
 
 bool _verbose = false;
 
 /// Runs a single compile for dartdevc.
 ///
 /// This handles argument parsing, usage, error handling.
 /// See bin/dartdevc.dart for the actual entry point, which includes Bazel
 /// worker support.
-int compile(List<String> args, {void printFn(Object obj)}) {
+Future<int> compile(List<String> args, {void printFn(Object obj)}) async {
   printFn ??= print;
 
   ArgResults argResults;
   AnalyzerOptions analyzerOptions;
   try {
     var parser = ddcArgParser();
     if (args.contains('--$ignoreUnrecognizedFlagsFlag')) {
       args = filterUnknownArguments(args, parser);
     }
     argResults = parser.parse(args);
     analyzerOptions = new AnalyzerOptions.fromArguments(argResults);
   } on FormatException catch (error) {
     printFn('$error\n\n$_usageMessage');
     return 64;
   }
 
   _verbose = argResults['verbose'];
   if (argResults['help'] || args.isEmpty) {
     printFn(_usageMessage);
     return 0;
   }
 
   if (argResults['version']) {
     printFn('$_binaryName version ${_getVersion()}');
     return 0;
   }
 
   try {
-    _compile(argResults, analyzerOptions, printFn);
+    await _compile(argResults, analyzerOptions, printFn);
     return 0;
   } on UsageException catch (error) {
     // Incorrect usage, input file not found, etc.
     printFn(error);
     return 64;
   } on CompileErrorException catch (error) {
     // Code has error(s) and failed to compile.
     printFn(error);
     return 1;
   } catch (error, stackTrace) {
@@ skipping 49 matching lines @@
 
 bool _changed(List<int> list1, List<int> list2) {
   var length = list1.length;
   if (length != list2.length) return true;
   for (var i = 0; i < length; ++i) {
     if (list1[i] != list2[i]) return true;
   }
   return false;
 }
 
-void _compile(ArgResults argResults, AnalyzerOptions analyzerOptions,
-    void printFn(Object obj)) {
+Future<Null> _compile(ArgResults argResults, AnalyzerOptions analyzerOptions,
+    void printFn(Object obj)) async {
   var compiler = new ModuleCompiler(analyzerOptions);
   var compilerOpts = new CompilerOptions.fromArguments(argResults);
   var outPaths = argResults['out'] as List<String>;
   var moduleFormats = parseModuleFormatOption(argResults);
   bool singleOutFile = argResults['single-out-file'];
   if (singleOutFile) {
     for (var format in moduleFormats) {
       if (format != ModuleFormat.amd && format != ModuleFormat.legacy) {
         _usageException('Format $format cannot be combined with '
             'single-out-file. Only amd and legacy modes are supported.');
@@ skipping 30 matching lines @@
     modulePath =
         path.withoutExtension(path.relative(firstOutPath, from: moduleRoot));
   } else {
     moduleRoot = path.dirname(firstOutPath);
     modulePath = path.basenameWithoutExtension(firstOutPath);
   }
 
   var unit = new BuildUnit(modulePath, libraryRoot, argResults.rest,
       (source) => _moduleForLibrary(moduleRoot, source, compilerOpts));
 
-  var module = compiler.compile(unit, compilerOpts);
+  JSModuleFile module = await compiler.compile(unit, compilerOpts);
   module.errors.forEach(printFn);
 
   if (!module.isValid) throw new CompileErrorException();
 
   // Write JS file, as well as source map and summary (if requested).
   for (var i = 0; i < outPaths.length; i++) {
     module.writeCodeSync(moduleFormats[i], outPaths[i],
         singleOutFile: singleOutFile);
   }
   if (module.summaryBytes != null) {
@@ skipping 57 matching lines @@
 }
 
 void _usageException(String message) {
   throw new UsageException(message, _usageMessage);
 }
 
 /// Thrown when the input source code has errors.
 class CompileErrorException implements Exception {
   toString() => '\nPlease fix all errors before compiling (warnings are okay).';
 }